According to the rule that rock mass structure plane and its shear strength properties were dominant in controlling the stability of rock slope, on the basis of rock mass structure plane network and its engineering boundary conditions, every possible slide path of rock slope was searched. By applying the theory of Lajtai and Einstein, Equivalent Mohr-Coulomb Yield Criterion, anti-slide force and
... [Show full abstract] sliding force of rock bridge and structure plane were calculated. Furthermore, got a rigorous formula for calculating safety coefficients; and moreover, skid-resisting reserve on each section of different slide paths and total skid-resisting reserve were ascertained. The comparative research of different slide path safety coefficients, total skid-resisting reserve and the density of total skid-resisting reserve was established. The research method for exploring dangerous slide path and stability of rock slope without obvious slip surface was studied. The example shows that applying safety coefficients and density of total skid-resisting reserve in assessing rock slope stability is feasible.